piers ipers peirs epirs ieprs eiprs pires ipres pries rpies irpes ripes peris epris preis rpeis erpis repis ierps eirps ireps rieps erips reips piesr ipesr peisr episr iepsr eipsr piser ipser psier spier isper siper pesir epsir pseir speir espir sepir iespr eispr isepr siepr esipr seipr pirse iprse prise rpise irpse ripse pisre ipsre psire spire ispre sipre prsie rpsie psrie sprie rspie srpie irspe rispe isrpe sirpe rsipe sripe persi eprsi presi rpesi erpsi repsi pesri epsri pseri speri espri sepri prsei rpsei psrei sprei rspei srpei erspi respi esrpi serpi rsepi srepi iersp eirsp iresp riesp erisp reisp iesrp eisrp iserp sierp esirp seirp irsep risep isrep sirep rsiep sriep ersip resip esrip serip rseip sreip
Note: these 'words' (valid or invalid) are all the permutations of the word piers. These words are obtained by scrambling the letters in piers.